- From: Graham Klyne <GK@ninebynine.org>
- Date: Mon, 26 Jan 2004 13:35:10 +0000
- To: David Martin <martin@ai.sri.com>
- Cc: public-sws-ig@w3.org
At 10:51 24/01/04 -0800, David Martin wrote: >Will the representation of the temporal aspects of services get used for >practical purposes on the Semantic Web? If so, what kinds of questions >will these representations be used to answer? What are the most important >questions for them to be able to answer? Are there any systems in >widespread use that apply temporal reasoning to solve practical problems >(and which might have some relevance for SW services)? I'm not sure if this is the sort of thing you're after... I have done a little work on developing a "real world" semantic web application to control network access [1]. The temporal element was the description of time intervals during which certain kinds of access is permitted. The reasoning support required is pretty simple; questions like: is this time (e.g. now) within this interval? Also, maybe more importantly, being able to transform an internal representation into a representation used by some other existing system -- this is mostly a syntactic matter, but (for example) there could be requirements to translate to intervals expressed as "from,to" or "from,duration". Handling of recurring intervals was the trickiest areas I encountered. My work was based on the emerging RDF vocabulary [2] for iCalendar format [3], and (after teasing out some ambiguities) the semantics thus provided were plenty adequate to handle my modest goals. #g -- [1] http://www.ninebynine.org/SWAD-E/Intro.html#HomeNetAccessDemo [2] http://www.w3.org/2002/12/cal/ [3] http://www.ietf.org/rfc/rfc2445.txt ------------ Graham Klyne For email: http://www.ninebynine.org/#Contact
Received on Monday, 26 January 2004 08:44:50 UTC